Mode of making secondary-battery plates



(No Mode-1.) I

W.fW. GRISCOM.

MODE 0E MAKING SEGO'NDAEY BATTERY PLATES.

No. 393,755. y Patented Dec. 4, 1888.

Jrg-1,

UNITEDV STATES PATENT OEEICE.

l IYILLIAH L GRISCCM, OF HAYERFORD COLLEGE, PENNSYLVANIA, ASSIGNOR TOTHE ELECTRICAL ACCUMULATOR COMPANY, OF NEWT YORK.

MODE OF MAKING SECONDARY-BATTERY PLATES.

SPECIFICATION forming part of Letters Patent No. 393,755, dated December4, 1888.

Application led September 24, 188

To all whom it may concern.-

Be it known that I, WILLIAM W. GRIscoM, a citizen of the United States,and a resident of Haverford College, in the county of Montgomery andState of Pennsylvania, have invented certain new and useful Improvementsin Secondary Batteries, of which the following is a specification Myinvention is an improvement in. the

1o method of preparing plates, grids, or supports for the activematerial in secondary batteries constructed according to the Faureprocess.

The object of my invention is to increase the conductivity, durability,and efficiency of such batteries.

I take a plate or form of lead of any suitable metal or alloy, Which maybe cast, pressed, or rolled, containing` a series of cells, holes, or

2o perforations, and subject it to pressure in a die or dies; and I forman incision iu the surface of the plate around or in proximity to theholes, by virtue of which the body of met-al Will be condensed and thedesired form or curvature given to the Walls surrounding the said holesor perforations. I prefer to form an annular incision around each-holeor perforation, at the same time contracting the Walls thereof ator'near the surface, so

3o that the perforations of the finished product are contracted at ornear the surfaces of the plate. By this means I increase the density ofthe metal divisions and vary the diameter of the holes or perforationsat the surface of the plate or grid'with respect to the diameter at ornear the central plane.

The accompanying drawings illustrate au arrangement of apparatus devisedby me and operating according to my invention.

Figure 1 shows a hydraulic press for op* erating the die. Fig. 2 is asection of a plate or grid to be operated upon.-V Fig. 3 shows a sectionof a completed plate and a section of the dies designed to produce anannular incision.

X In Fig. l, II is a fixed standard integral with the bed-plate carryinga die, D. D is a'second die, similar to D', and having a reciprocatingmovement With respect to D. It

7. Serial No. 250,561. (No model.)

is Xed to a rod moving in hearings in the 5o Standard H.

P, Fig. 2, is a plate of metal or alloy cast, rolled, or pressed,preferably of lead. It contains numerous circular or equivalent holes orperforations extending through the plate and separated from one anotherby webs, Walls, or partitions of substantially uniform dimensions. Suchplate should have the outline required for the finished product. Thisplate I place in the press II between the dies 6o D D. The form of thesedies is best seen by reference to Fig. The tubular sections, in diametera little larger than the holes in the plate P, Fig. 2, have their inneredges beveled to present a sharp edge and the greatest diameter at thefree ends. These dies D D are causedv to close upon the plate P Withgreat pressure, forming an annular incision round each and everyperforation, at the same time contracting the Walls of the 7operforations at the surface. The active material is placed in theseperforations in the form of a paste and hardens in position. Thegreatest diameter being at or near the center, the molds of activematerial cannot be removed Without being broken or divided mechanically.

'What I claim, and' desire to secure by Letters Patent, is l 1. Theimprovement in the mode of mal;- 8o ing secondary battery plates hereindescribed, Which consists in forming incisions in the surface of theplate in proximity to the holes or perforations and subjecting the plateso prepared to pressure, whereby the body of the metal is condensed andthe diameter of the perforations at or near the surface of the plate iscontracted with respect to the diameter at or near the central plane.

2. An improvement in the mode of making 9o secondary-battery plates,which consists in forming annular incisions in the surface of the platearound the holes or perforations, and simultaneously subjecting theplates so prepared to pressure, in virtue of which the body of the metalwill be condensed and the proper curvature of surface given to thesurrounding Walls of the holes.

2i. The improvcmcnt in the modo oi' muklmciod it or noni' tho suiinm;oi' tho pluto, 1o infg` secondary battery plaies heroin doiSubstantially as described. scribed, which Consists in taking' a plaiehav- Signed at New York, in the oounliy of Now ingl :i Soiios of holesor poifjorniions sfpmzli'od York find Sini@ oi' New York, this 23d dflyo' from 0:1011 othol' by substzmlizlily uniform Sopiombm, D. i337.

walls :ind forming' :1x1 incision in ille sul'l'nco WM. (RIS(`(').\I. ofH10 pleito :wound oi.l iu proximity to Such \\'i1nossos: bolos, whoiobyThe Walls or divisions .'uo di- E. NIMYKIHK, vidod :1nd 111e bolos m*purfm'niions m'o vonll. SHUUHDS.

